Configuration.py

import logging
import imp
import types
import pprint
import cPickle
from BlissFramework.Utils import PropertyBag
from BlissFramework import BaseLayoutItems
from BlissFramework.BaseComponents import NullBrick


def loadModule(brickName):
    fp = None
    try:
        fp, pathname, description = imp.find_module(brickName, None)

        mod = imp.load_module(brickName, fp, pathname, description)
    except:
        if fp:
            fp.close()

        logging.getLogger().exception('Cannot import module %s', brickName)
                
        return None
    else:
        return mod


def loadBrick(brick_type, brick_name):
    module = loadModule(brick_type)

     
    if module is not None:
        try:
            classObj = getattr(module, brick_type)
        except AttributeError:
            logging.getLogger().error('Cannot load brick %s : cannot found class %s in module', brick_name, brick_type)
            return NullBrick(None, brick_name)
        else:
            try:
                newInstance = classObj(None, brick_name)
            except:
                logging.getLogger().exception('Cannot load brick %s : initialization failed', brick_name)
                return NullBrick(None, brick_name)
            else:
                newInstance._BlissWidget__stop()
                return newInstance
    else:
        logging.getLogger().error("Cannot load brick %s : module could not be loaded.", brick_name)
        return NullBrick(None, brick_name)
    

class Configuration:
    classes = { "hbox": BaseLayoutItems.ContainerCfg,
                "vbox": BaseLayoutItems.ContainerCfg,
                "vgroupbox": BaseLayoutItems.ContainerCfg,
                "hgroupbox": BaseLayoutItems.ContainerCfg,
                "hspacer": BaseLayoutItems.SpacerCfg,
                "vspacer": BaseLayoutItems.SpacerCfg,
                "label": BaseLayoutItems.LabelCfg,
                "icon": BaseLayoutItems.IconCfg,
                "tab": BaseLayoutItems.TabCfg,
                "hsplitter": BaseLayoutItems.SplitterCfg,
                "vsplitter": BaseLayoutItems.SplitterCfg }

    
    def __init__(self, config=None):
        self.hasChanged = False
        
        if config is None:
            self.windows_list = []
            self.windows = {}
            self.bricks = {}
            self.items = {}
        else:
            self.load(config)
       

    def findContainer(self, container_name):
        try:
            parent = self.windows[container_name]
        except KeyError:
            try:
                parent = self.items[container_name]
            except KeyError:
                return
        return parent
    
      
    def addWindow(self):
        i = sum([ x.startswith("window") and 1 or 0 for x in self.windows ])
        window_name = "window%d" % i
        while window_name in self.windows:
            i+=1
            window_name = "window%d" % i

        self.windows_list.append(BaseLayoutItems.WindowCfg(window_name))
                            
        self.windows[window_name] = self.windows_list[-1]

        self.hasChanged = True
        
        return self.windows_list[-1]


    def addItem(self, item_type, parent):
        if parent is None:
            logging.getLogger().error("Invalid parent container")
            return
        
        if item_type in Configuration.classes:
            i = sum([ x.startswith(item_type) and 1 or 0 for x in self.items ])
            item_name = "%s%d" % (item_type, i)
            while item_name in self.items:
                i+=1
                item_name = "%s%d" % (item_type, i)

            cfgClass = Configuration.classes[item_type]
            error = parent.addChild(cfgClass(item_name, item_type))
            if len(error) == 0:
                self.items[item_name] = parent["children"][-1]

                self.hasChanged = True
                
                return parent["children"][-1]
            else:
                return error
        else:
            logging.getLogger().error("Item of this type (%s) does not exist.", item_type)


    def addBrick(self, brick_type, parent):
        i = sum([ x.startswith(brick_type) and 1 or 0 for x in self.bricks ])
        brick_name = "%s%d" % (brick_type, i)
        while brick_name in self.bricks:
            i+=1
            brick_name="%s%d" % (brick_type, i)

        brick = loadBrick(brick_type, brick_name)

        error = parent.addChild(BaseLayoutItems.BrickCfg(brick_name, brick_type, brick))
        
        if len(error) == 0:
            self.bricks[brick_name] = parent["children"][-1]

            self.hasChanged = True
                
            return parent["children"][-1]
        else:
            brick.close(True)
            
            return error
       

    def findParent(self, item_name, nodeset=[], parent=None):
        i = 0
        for item in nodeset:
            if item["name"] == item_name:
                return (parent, i)
            else:
                p, index = self.findParent(item_name, nodeset=item["children"], parent=item)
                if p is not None:
                    return (p, index)
            i+=1

        return (None, -1)


    def findAllChildren(self, parent_item):
        return parent_item["children"] + sum([self.findAllChildren(child) for child in parent_item["children"]], [])
        

    def findItem(self, item_name, nodeset=None):
        if nodeset is None:
            nodeset = self.windows_list

        for item in nodeset:
            if item["name"] == item_name:
                return item
            else:
                _item = self.findItem(item_name, item["children"])
                if _item is not None:
                    return _item
        

    def findAllChildrenWType(self, item_type, parent_item):
        """valid types are: brick, container, splitter..."""
        try:
            t = getattr(BaseLayoutItems, "%sCfg" % str(item_type).title())
        except AttributeError:
            return {}
        
        def findChildrenWType(item_type, item):
            children = {}

            for child in item["children"]:
                if isinstance(child, t):
                    children[child["name"]]=child
                children.update(findChildrenWType(item_type, child))

            return children
        
        return findChildrenWType(item_type, parent_item)
                

    def rename(self, parent_item_name, child_pos, new_item_name):
        parent_item = self.findItem(parent_item_name)

        if parent_item is None:
            # window
            item = self.windows_list[child_pos]
        else:
            item = parent_item["children"][child_pos]

        old_item_name = item["name"]

        if new_item_name == old_item_name:
            return None

        if self.findItem(new_item_name):
            # new name conflicts with existing item !
            return old_item_name
        else:
            item.rename(new_item_name)

            recv = "receiver"
            if old_item_name in self.items:
                del self.items[old_item_name]
                self.items[new_item_name]=item
            elif old_item_name in self.bricks:
                del self.bricks[old_item_name]
                self.bricks[new_item_name]=item
            elif old_item_name in self.windows:
                del self.windows[old_item_name]
                self.windows[new_item_name]=item
                recv = "receiverWindow"
            
            all_items = {}
            all_items.update(self.windows)
            all_items.update(self.bricks)
            all_items.update(self.items)

            for item in all_items.itervalues():
                for c in item.connections:
                    if c[recv]==old_item_name:
                        print "receiver item %s in %s has been changed to %s" % (old_item_name, item.name, new_item_name)
                        c[recv]=new_item_name

            self.hasChanged=True
        

    def remove(self, item_name):
        parent, i = self.findParent(item_name, self.windows_list)

        if parent is not None:
            try:
                del self.items[item_name]
            except KeyError:
                try:
                    del self.bricks[item_name]
                except KeyError:
                    pass

            parent.removeChild(i)

            self.hasChanged = True
            
            return True
        else:
            try:
                window = self.windows[item_name]
            except KeyError:
                return False
            else:
                self.windows_list.remove(window)

                del self.windows[item_name]
                
                self.hasChanged = True
                
                return True


    def moveUp(self, item_name):
        """Move an item up in the hierarchy

        Return the name of the new item's parent
        """
        parent, index = self.findParent(item_name, self.windows_list)

        #print item_name, parent["name"], index

        if parent is None:
            return None

        item = parent["children"][index]

        assert item["name"]==item_name
        
        if index == 0:
            # cannot move
            return None
        else:
            #print 'previous is :', parent["children"][index-1]["name"]
            del parent["children"][index]
            parent["children"].insert(index-1, item)
            self.hasChanged=True
            return parent["name"]
        

    def moveDown(self, item_name):
        """Move an item down in the hierarchy
        
        Return the name of its new parent item
        """
        parent, index = self.findParent(item_name, self.windows_list)

        #print item_name, parent["name"], index
        
        if parent is None:
            return None
        
        item = parent["children"][index]

        assert item["name"]==item_name
        
        try:
            nextItem = parent["children"][index + 1]
        except IndexError:
            return None
        else:
            #print 'next is :', nextItem["name"]
            del parent["children"][index]
            #print '1'
            parent["children"].insert(index+1, item)
            #print '2'
            self.hasChanged=True
            return parent["name"]

        
    def moveItem(self, source_item_name, target_item_name):
        """Move an item to another place in the hierarchy
        
        Mainly useful for drag'n'drop on the list elements.
        """
        if source_item_name == target_item_name:
            return False
        
        source_parent_cfg, source_item_pos = self.findParent(source_item_name, self.windows_list)
        target_parent_cfg, target_item_pos = self.findParent(target_item_name, self.windows_list)

        if source_parent_cfg is None:
            # cannot drag an entire window
            return False
        else:
            source_item_cfg = source_parent_cfg["children"][source_item_pos]

        if target_parent_cfg is None:
            # we are dropping on a window
            target_item_cfg = self.windows[target_item_name]

            if not self.isContainer(source_item_cfg):
                return False
        else:
            target_item_cfg = target_parent_cfg["children"][target_item_pos]
        
        if target_item_cfg in self.findAllChildren(source_item_cfg):
            # cannot move a parent in a child
            return False
            
        del source_parent_cfg["children"][source_item_pos]

        if self.isContainer(target_item_cfg):
            target_item_cfg["children"].insert(0, source_item_cfg)
            #print [x["name"] for x in target_item_cfg["children"]]
        else:
            target_parent_cfg["children"].insert(target_item_pos, source_item_cfg)    

        self.hasChanged=True
        
        return True

##     def change(self, item, new_type=None):
##         if new_type is None:
##             new_types = { "hbox": "vbox",
##                           "vbox": "hbox",
##                           "vspacer": "hspacer",
##                           "hspacer": "vspacer",
##                           "hsplitter": "vsplitter",
##                           "vsplitter": "hsplitter" }

##             try:
##                 item["type"] = new_types[item["type"]]
##             except KeyError:
##                 pass
##         else:
##             item["type"] = new_type


    def dump(self):
        pprint.pprint(self.windows_list)


    def dump_tree(self):
        wl = []

        for window_cfg in self.windows_list:
            children = []

            def add_children(item_cfg):
                children = []

                for child in item_cfg["children"]:
                    children.append({ "name": child["name"], "children": add_children(child) })

                return children
            
            wl.append({ "name": window_cfg["name"], "children": add_children(window_cfg) })

        pprint.pprint(wl)
                

    def save(self, filename):
        #print 'saving to', filename, 'id is', id(self)
        try:
            cfg = repr(self.windows_list)
        except:
            logging.getLogger().exception("panic: an exception occured while serializing GUI objects")
            return False
        else:   
            try:
                config_file = open(filename, "w")
            except:
                logging.getLogger().exception("Cannot save configuration to %s", filename)
                return False
            else:
                config_file.write(cfg)
                config_file.close()

                self.hasChanged=False
            
            return True


    def load(self, config):
         self.windows_list = []
         self.windows = {}
         self.bricks = {}
         self.items = {}
         self.hasChanged=False

         self.windows_list = config

         def loadChildren(children):
             i = 0
             for child in children:
                 newItem = None
                 
                 if "brick" in child:
                     b = loadBrick(child["type"], child["name"])
                     child["brick"] = b

                     newItem = BaseLayoutItems.BrickCfg(child["name"], child["type"])
                     newItem["brick"] = b
                     self.bricks[child["name"]] = newItem
                 else:  
                     if child["type"] == "window":
                         newItem = BaseLayoutItems.WindowCfg(child["name"])
                         self.windows[child["name"]] = newItem
                     else:
                         newItemClass = Configuration.classes[child["type"]]
                         newItem = newItemClass(child["name"], child["type"])
                         self.items[child["name"]] = newItem

                 if newItem is not None:
                     if type(child["properties"]) == types.StringType:
                         try:
                             #print "loading properties for %s" % child["name"]
                             newItem.setProperties(cPickle.loads(child["properties"]))
                         except:
                             logging.getLogger().exception("Error: could not load properties for %s", child["name"])
                             newItem.properties = PropertyBag.PropertyBag()
                     else:
                         newItem.setProperties(child["properties"])
                         
                     child["properties"] = newItem.properties

                     newItem.__dict__ = child
                     children[i] = newItem
                     
                     loadChildren(child["children"])
                 i += 1
                         
         loadChildren(self.windows_list)


    def isContainer(self, item):
        return isinstance(item, BaseLayoutItems.ContainerCfg)
    

    def isSpacer(self, item):
        return isinstance(item, BaseLayoutItems.SpacerCfg)
       

    def isWindow(self, item):
        return isinstance(item, BaseLayoutItems.WindowCfg)


    def isBrick(self, item):
        return isinstance(item, BaseLayoutItems.BrickCfg)


    def reload_brick(self, brick_cfg):
        if type(brick_cfg) == types.StringType:
            brick_cfg = self.findItem(brick_cfg)

        brick_name = brick_cfg["name"]
        brick_type = brick_cfg["type"]
        
        #print 'reloading', brick_name
        parent, index = self.findParent(brick_name, self.windows_list)

        if parent is not None:
            brick = loadBrick(brick_type, brick_name)

            old_brick_cfg = parent["children"][index]
            new_brick_cfg = BaseLayoutItems.BrickCfg(brick_name, brick_type, brick)
            parent["children"][index]=new_brick_cfg
            
            new_brick_cfg.setProperties(old_brick_cfg["properties"])
                
            return new_brick_cfg